Table 1 Baseline characteristics of 311,097 EPIC cohort participants
Study variables | All women |
|---|---|
(n = 311,097) | |
Age at recruitment (median, range) | 51.1 (19.9-98.5) |
Age end of follow-up (1st tumor) (median, range) | 62.0 (21.2-102.4) |
Years of follow up (median, range) | 11.3 (0.0-16.7) |
Menopausal status | |
Premenopausal | 108,084 (34.7) |
Peri/Unknown | 58,345 (18.8) |
Postmenopausal | 144,668 (46.5) |
Age at menarche (median, range) | 13.0 (8.0-20.0) |
Age at menopause (median, range)1 | 50.0 (16.0-67.0) |
Ever full-term pregnancy (yes, %) | 255,877 (84.5) |
Age at first full-term pregnancy (median, range)2 | 24.0 (12.0-56.0) |
Time between menarche and first pregnancy (years) (median, range)2 | 11.0 (0.0-41.0) |
Number of full-term pregnancies 2 | |
1 child | 46,572 (18.8) |
2 children | 122,590 (49.4) |
≥3 children | 78,983 (31.8) |
Breastfeeding (yes, %)2 | 200,885 (83.8) |
Duration of breastfeeding, all pregnancies (months) (median, range)2,3 | 6.0 (0.2-286.4) |
Age at last full-term pregnancy (median, range)2 | 29.0 (13.0-56.0) |
Time since last full-term pregnancy (years) (median, range)2 | 22.9 (0.0-69.1) |
Ever had an abortion (yes, %)4 | 87,130 (40.1) |
Oral contraceptive (OC) use | |
Never OC user | 125,229 (41.4) |
Past OC user | 160,926 (53.2) |
Current OC user | 16,560 (5.5) |
Age when you started using the pill (median, range)5 | 24.0 (8.0-50.0) |
Duration of using the pill (years) (median, range)5 | 5.0 (1.0-15.0) |